Work around registry URLs with multiple slashes by outputting paths with single slashes

[nutjob4life]

🗒️ Summary

Merge this to workaround registry file_ref URLs that have double-slashes in them as reported in #162 and experience by some users.

⚙️ Test Data and/or Report

Before:

$ pds-deep-registry-archive --quiet --site PDS_ATM urn:nasa:pds:cassini_uvis_solarocc_beckerjarmak2023::1.0
$ egrep -c '//data' cassini_uvis_solarocc_beckerjarmak2023_v1.0_*_sip_v1.0.tab
86

After:

$ pds-deep-registry-archive --quiet --site PDS_ATM urn:nasa:pds:cassini_uvis_solarocc_beckerjarmak2023::1.0
$ egrep -c '//data' cassini_uvis_solarocc_beckerjarmak2023_v1.0_*_sip_v1.0.tab
0

♻️ Related Issues

• As a data custodian, I want the Deep Archive to work around invalid URLs in the Registry #162
• NASA-PDS/operations#476